CN102566102A - Method for repairing line defects of liquid crystal panels - Google Patents

Abstract

The invention discloses a method for repairing line defects of liquid crystal panels. A data line of an array substrate side of a liquid crystal panel is stacked with a common line, signals of the data line are direct-current black screen voltage signals during light-on detection of the liquid crystal panel, signals of a scanning line are high-level pulse voltage signals which are sequentially opened, at least parts of signals of the common line are low-level pulse voltage signals when the signals of the scanning line are high-level signals, the signals of the common line are high-level voltage signals when the signals of the scanning line are low-level signals, bright trace is positioned at locations around short circuit of the data line and the common line, and is the brightest at a short circuit location, and the brightest location is the short circuit location of the data line and the common line, and the signals of the common line at the short circuit location are disconnected. The short circuit location of the data line and the common line can be accurately determined by the aid of the method.

Description

A method for repairing line defects of liquid crystal panels

technical field

The invention relates to a method for repairing line defects of a liquid crystal panel.

Background technique

In order to reduce the backlight cost of LCD (Liquid Crystal Display), the overlapping design of the data line and the common line on the array substrate side of the liquid crystal panel has become the mainstream design for high pixel aperture ratio, but this design increases the risk of short circuit between the data line and the common line. And the precise location of the short circuit between the two is difficult to determine.

Contents of the invention

Purpose of the invention: In view of the problems and deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a method for repairing line defects of liquid crystal panels, which can accurately determine the position of the short circuit between the data line and the common line.

Technical solution: In order to achieve the purpose of the above invention, the technical solution adopted in the present invention is a method for repairing line defects of a liquid crystal panel. The data line on the array substrate side of the liquid crystal panel overlaps with the common line. During the lighting detection process of the liquid crystal panel , the data line signal is a DC black screen voltage, the scan line signal is a high-level pulse voltage that is turned on sequentially, the common line signal is a low-level pulse voltage at least part of the time when the scan line signal is high, and the common line signal is When the line signal is low level, it is a high level voltage; a bright line appears at the position where the data line and the common line are short-circuited, and the short-circuit position is the brightest, then the brightest position is the position where the data line and the common line are short-circuited ;Finally disconnect the common line signal at the short circuit.

Grooves may be provided on both sides of the corresponding data line at intersections of the transverse portion and the longitudinal portion of the common line.

Beneficial effects: the present invention uses a special detection signal to accurately determine the short-circuit position between the data line and the common line on the array substrate side, and can repair it without causing other faults.

Description of drawings

Figure 1 is a schematic diagram of a pixel plane of an existing high-aperture design;

Fig. 2 is the sectional schematic diagram of A-A' among Fig. 1;

Fig. 3 is a schematic diagram of signal timing of the present invention;

Fig. 4 is the schematic diagram of detection result of the present invention;

FIG. 5 is a schematic diagram of a local planar structure of a pixel in the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, further illustrate the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications in equivalent forms all fall within the scope defined by the appended claims of this application.

As shown in Figure 1, the data line and the common line completely overlap, which can reduce the width of the black matrix (Black Matrix, BM) on the side of the color filter substrate (Color Filter, CF) to increase the aperture ratio. As shown in Figure 2, from bottom to top are the common line, the first insulating layer, the data line, the second insulating layer and the pixel electrode. It can be seen from Figure 2 that since the data line and the common line completely If the layer is slightly broken, the data line and the common line may be short-circuited, and the risk increases, and the location of the short-circuit is difficult to determine.

As shown in FIG. 3 , one frame (Frame) is divided into ON/OFF periods. In the ON period, the scan line signals (that is, Gate signals, G1, G2, G3, ..., G12 in the figure) are turned on sequentially, and are divided into 12 areas (can also be divided into other number of areas), and two adjacent scan lines Set the output enable (OE, Output Enable) time between line pulses (Gate Pulse); in addition, the common electrode voltage Vcom on the CF side = 0V; the source (Source) voltage provided to the data line is 5V, and a black screen is output; the array The common line voltage Cs on the substrate side is a 5V/0V square wave, and the pulse timing of the common line corresponds to the pulse timing of the scanning lines. Specifically, the duration of the high-level pulse voltage of each scanning line is 16us. When scanning When the line is at high level, the common line is pulled from high level to low level at 9us, and then, when the scanning line changes from high level to low level, the common line is pulled to high level synchronously. That is, in this embodiment, the time of the low-level pulse of the common line is half of the time of the high-level pulse of the scanning line. In fact, the time of the low-level pulse of the common line is specifically a fraction of the time of the high-level pulse of the scanning line. There is no strict limitation here, and it is adjusted according to the actual display effect.

During the lighting detection process as described in the previous paragraph, as shown in Figure 4, the normal LCD panel displays a black screen, but bright lines appear at the position where the data line and the common line are short-circuited, and the short-circuit position is the brightest, up and down The two sides gradually become darker. You can observe which point is the brightest with human eyes, or use a microscope to judge which point is the brightest when the LCD panel is lit. The brightest point is the short circuit position. The reason for the analysis is as follows: In the upper area of the short circuit between the data line and the common line (S-Cs short), since the Source voltage is 5V, and is less affected by the Cs voltage (because the data line is a stable DC voltage, it is not easy to be pulled by the Cs pulse voltage , and the Cs voltage is the same as the Source voltage at 5V most of the time), so it is a black screen; in the area below the S-Cs short position, the Source voltage is not greatly affected by Cs, so it is also close to the black screen; In the area of the Csshort position, the Source voltage is affected by the Cs voltage and will be pulled to a white screen. However, due to the resistance and capacitance delay of the Source, the pixels at the short point are the brightest, and the pixels farther away from the short point are darker, showing a gradual pattern. Therefore, it can be judged that S-Cs short occurred in the brightest pixel. After knowing the specific location of the data line and the common line where the short circuit occurs, then when repairing, use a laser to cut off the common line on both sides of the data line at the short circuit, so that the common line at the short circuit itself has no signal (because the signal of the common line comes from The two ends of the horizontal part of the common line are input (not shown in the figure), so the common lines on both sides of the data line must be cut off), as shown in Figure 5, the intersection of the horizontal part and the vertical part of the common line is located at the corresponding There are grooves on both sides of the data line, so that when cutting with a laser, the pixel electrode will not be cut, and the problem of short circuit between the common line and the pixel electrode caused by repairing the short circuit between the common line and the data line is avoided (Fig. The dotted line in 5 is the laser cutting position).

Claims (2)

1. the line defect restorative procedure of a liquid crystal panel; It is characterized in that: the data line and the concentric line of the array base palte side of liquid crystal panel are overlapping; In said liquid crystal panel was lit a lamp the process that detects, data line signal was the black picture voltage of direct current, the high level pulse voltage of scanning-line signal for opening successively; The concentric line signal is that the part-time at least of high level is a low level pulse voltage at scanning-line signal, and the concentric line signal is that low level time is a high level voltage at scanning-line signal; Bright line appears in the position in data line and concentric line short circuit, and the position of short circuit is for the brightest, and then this high light is the position of data line and concentric line short circuit; Break off the concentric line signal of short circuit place at last.

2. according to the line defect restorative procedure of the said a kind of liquid crystal panel of claim 1, it is characterized in that: the lateral part of said concentric line and the intersection of longitudinal component, the both sides that are positioned at corresponding data line are provided with groove.

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